"use client";

import { useSession } from "next-auth/react";
import { usePathname, useSearchParams } from "next/navigation";
import Script from "next/script";
import { useEffect, useState, useCallback, useMemo } from "react";

declare global {
  interface Window {
    Plain?: {
      // eslint-disable-next-line @typescript-eslint/no-explicit-any
      init: (config: any) => void;
      open: () => void;
    };
    plainScriptLoaded?: () => void;
    __PLAIN_CONFIG__?: PlainChatConfig;
  }
}

interface PlainChatConfig {
  appId: string;
  customerDetails: {
    email: string;
    emailHash: string;
    fullName: string;
    shortName: string;
    chatAvatarUrl: string;
  };
  links: Array<{
    icon: string;
    text: string;
    url: string;
  }>;
  chatButtons: Array<{
    icon: string;
    text: string;
    type: string;
    form?: {
      fields: Array<{
        type: string;
        placeholder: string;
        options: Array<{
          icon: string;
          text: string;
          threadDetails: {
            severity: string;
            labelTypeIds: Array<string>;
            issueType: string;
            priority: string;
          };
        }>;
      }>;
    };
  }>;
  entryPoint: {
    type: string;
  };
  hideBranding: boolean;
  theme: string;
  style: {
    brandColor: string;
    launcherBackgroundColor: string;
    launcherIconColor: string;
  };
  position: {
    bottom: string;
    right: string;
  };
}

const PlainChat = () => {
  const [config, setConfig] = useState<PlainChatConfig | null>(null);
  const [isSmallScreen, setIsSmallScreen] = useState(false);
  const { data: session } = useSession();
  const pathname = usePathname();
  const searchParams = useSearchParams();

  const shouldOpenPlain = pathname === "/event-types" && searchParams?.has("openPlain");
  const userEmail = session?.user?.email;

  const isAppDomain = useMemo(() => {
    const restrictedPathsSet = new Set(
      (process.env.NEXT_PUBLIC_PLAIN_CHAT_EXCLUDED_PATHS?.split(",") || []).map((path) => path.trim())
    );

    const pathSegments = pathname?.split("/").filter(Boolean) || [];

    return (
      typeof window !== "undefined" &&
      window.location.origin === process.env.NEXT_PUBLIC_WEBAPP_URL &&
      !pathSegments.some((segment) => restrictedPathsSet.has(segment))
    );
  }, [pathname]);

  const checkScreenSize = useCallback(() => {
    if (typeof window === "undefined") return;

    const isSmall = window.innerWidth < 768;
    setIsSmallScreen(isSmall);

    if (isSmall && window.Plain) {
      const plainElement = document.querySelector("#plain-container");
      plainElement?.remove();
      window.Plain = undefined;
    } else if (!isSmall && window.Plain === undefined) {
      window.plainScriptLoaded?.();
    }
  }, []);

  const initConfig = useCallback(async () => {
    if (!userEmail) return;

    try {
      const response = await fetch("/api/plain-hash", {
        method: "POST",
        headers: {
          "Content-Type": "application/json",
        },
      });

      if (!response.ok) {
        const errorText = await response.text();
        throw new Error(`Failed to generate hash: ${errorText}`);
      }

      const data = await response.json();

      if (!data.hash || !data.email || !data.appId) {
        throw new Error("Missing required fields in API response");
      }

      const plainChatConfig: PlainChatConfig = {
        appId: data.appId,
        customerDetails: {
          email: data.email,
          shortName: data.shortName,
          fullName: data.fullName,
          emailHash: data.hash,
          chatAvatarUrl: data.chatAvatarUrl,
        },
        links: [
          {
            icon: "book",
            text: "Documentation",
            url: "https://cal.com/docs",
          },
          {
            icon: "chat",
            text: "Ask the community",
            url: "https://github.com/calcom/cal.com/discussions",
          },
        ],
        chatButtons: [
          {
            icon: "chat",
            text: "Ask a question",
            type: "primary",
          },
          {
            icon: "bulb",
            text: "Send feedback",
            type: "default",
          },
          {
            icon: "error",
            text: "Report an issue",
            type: "default",
            form: {
              fields: [
                {
                  type: "dropdown",
                  placeholder: "Select severity...",
                  options: [
                    {
                      icon: "support",
                      text: "I'm unable to use the app",
                      threadDetails: {
                        severity: "critical",
                        issueType: "critical",
                        labelTypeIds: ["lt_01JFJWNWAC464N8DZ6YE71YJRF"],
                        priority: "u",
                      },
                    },
                    {
                      icon: "error",
                      text: "Major functionality degraded",
                      threadDetails: {
                        severity: "major",
                        issueType: "major",
                        labelTypeIds: ["lt_01JFJWP3KECF1YQES6XF212RFW"],
                        priority: "h",
                      },
                    },
                    {
                      icon: "bug",
                      text: "Minor annoyance",
                      threadDetails: {
                        severity: "minor",
                        issueType: "minor",
                        labelTypeIds: ["lt_01JFJWPC8ADW0PK28JHMJR6NSS"],
                        priority: "l",
                      },
                    },
                  ],
                },
              ],
            },
          },
        ],
        entryPoint: {
          type: "chat",
        },
        hideBranding: true,
        theme: "auto",
        style: {
          brandColor: "#FFFFFF",
          launcherBackgroundColor: "#262626",
          launcherIconColor: "#FFFFFF",
        },
        position: {
          bottom: "20px",
          right: "20px",
        },
      };

      if (process.env.NODE_ENV === "development" || process.env.NODE_ENV === "test") {
        window.__PLAIN_CONFIG__ = plainChatConfig;
      }

      setConfig(plainChatConfig);

      if (shouldOpenPlain) {
        const timer = setTimeout(() => {
          if (window.Plain) {
            window.Plain.open();
          }
        }, 100);
        return () => clearTimeout(timer);
      }
    } catch (error) {
      console.error("Failed to initialize Plain Chat:", error);
    }
  }, [userEmail, shouldOpenPlain]);

  useEffect(() => {
    if (!isAppDomain) return;

    checkScreenSize();
    window.addEventListener("resize", checkScreenSize);
    initConfig();

    return () => window.removeEventListener("resize", checkScreenSize);
  }, [isAppDomain, checkScreenSize, initConfig, userEmail]);

  const plainChatScript = `
    window.plainScriptLoaded = function() {
      if (window.Plain && ${Boolean(config)}) {
        try {
          Plain.init(${config ? JSON.stringify(config) : null});
        } catch (error) {
          console.error("Failed to initialize Plain:", error);
        }
      }
    }
  `;

  if (!isAppDomain || isSmallScreen || !config || typeof window === "undefined") return null;

  return (
    <>
      <Script
        id="plain-chat"
        src="https://chat.cdn-plain.com/index.js"
        strategy="afterInteractive"
        onLoad={() => window.plainScriptLoaded?.()}
      />
      <Script
        id="plain-chat-init"
        strategy="afterInteractive"
        dangerouslySetInnerHTML={{ __html: plainChatScript }}
      />
    </>
  );
};

export default PlainChat;